The whole pump chamber is divided into chamber A and chamber B by piston. Though the construction, shape and design of gear, vane and globe pumps are a bit different, they fall under the same category of rotary pumps. The working of all these pumps are based on the same principle, i.e pumping of the liquid with the help of rotating elements. The piston vacuum pump is one of the vacuum equipment to remove the general gas or contain a small amount of condensable vapor. When the rotor turns the centrifugal force throws the vanes against the cylindrical wall and creates a chamber between the rotor and the cylinder. Depending upon the type of pump in question, rotary vane vacuum pumps may be equipped with a vacuum safety valve. Gear pumps screw pumps vane pumps etc. “The rotary pump consists of a fixed casing containing gears, cams, screws, plungers or similar elements actuated by rotation of the drive shaft. There are a number of different pumps that fall into the category of a Rotary pump. The rotating elements can be gears, screws or vanes. It can be used alone or as a front-stage pump of other high vacuum pumps, but it is not used for pumping from one container to another as a conveying pump.

A Rotary pump is a pump that derives it’s operation from a rotary shaft. A rotor (2) is positioned eccentrically in the pump cylindrical housing (1). Rotary Piston Pump Working Principle Rotary piston pump is a kind of pump with special shape, such as cam pump, spherical rotor pump and Roots pump. Operation principle show in working principle graph: A rotary piston with slide valve across ecentric wheel driven by shaft within the housing. It is used in vacuum smelting, vacuum drying, vacuum impregnation and other vacuum operations. Piston pole can slide and swing freely in arch track. The free moving vanes (4) are inserted into a numerous rotor slots (3). The vacuum safety valve isolates the pump from the vacuum chamber in the event of intentional or unintentional standstill, and uses the displaced gas to vent the pumping system in order to prevent oil from rising into the vacuum chamber.

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